b
$ b

• http：//commons.apache。 org / cli /


• http：// www。 martiansoftware.com/jsap/

或自行编辑：

• http： //docs.oracle.com/javase/7/docs/api/java/util/Scanner.html

例如，这是您使用 commons-cli 解析2个字符串参数：

  import org.apache.commons.cli。*; 

 public class Main {


 public static void main（String [] args）throws Exception {

选项options = new Options （）; 

选项输入=新选项（i，输入，true，输入文件路径）; 
 input.setRequired（true）; 
 options.addOption（input）; 

选项output = new Option（o，output，true，output file）; 
 output.setRequired（true）; 
 options.addOption（output）; 

 CommandLineParser parser = new DefaultParser（）; 
 HelpFormatter formatter = new HelpFormatter（）; 
 CommandLine cmd; 

 try {
 cmd = parser.parse（options，args）; 
} catch（ParseException e）{
 System.out.println（e.getMessage（））; 
 formatter.printHelp（utility-name，options）; 

 System.exit（1）; 
 return; 
} 

 String inputFilePath = cmd.getOptionValue（input）; 
 String outputFilePath = cmd.getOptionValue（output）; 

 System.out.println（inputFilePath）; 
 System.out.println（outputFilePath）; 

} 

} 
 

行：

  $> java -jar target / my-utility.jar -i asd 
缺少必需的选项：o 

用法：utility-name 
 -i， - 输入< arg&输入文件路径
 -o， -  output< arg>输出文件
 

What is a good way of parsing command line arguments in Java?

Check these out:

• http://commons.apache.org/cli/
• http://www.martiansoftware.com/jsap/

Or roll your own:

• http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html

For instance, this is how you use commons-cli to parse 2 string arguments:

import org.apache.commons.cli.*;

public class Main {


    public static void main(String[] args) throws Exception {

        Options options = new Options();

        Option input = new Option("i", "input", true, "input file path");
        input.setRequired(true);
        options.addOption(input);

        Option output = new Option("o", "output", true, "output file");
        output.setRequired(true);
        options.addOption(output);

        CommandLineParser parser = new DefaultParser();
        HelpFormatter formatter = new HelpFormatter();
        CommandLine cmd;

        try {
            cmd = parser.parse(options, args);
        } catch (ParseException e) {
            System.out.println(e.getMessage());
            formatter.printHelp("utility-name", options);

            System.exit(1);
            return;
        }

        String inputFilePath = cmd.getOptionValue("input");
        String outputFilePath = cmd.getOptionValue("output");

        System.out.println(inputFilePath);
        System.out.println(outputFilePath);

    }

}

usage from command line:

$> java -jar target/my-utility.jar -i asd                                                                                       
Missing required option: o

usage: utility-name
 -i,--input <arg>    input file path
 -o,--output <arg>   output file